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Temperature-resistant and flexible supercapacitors based on 10-inch wafer-scale nanocarbon films

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  • ReceivedDec 24, 2018
  • AcceptedJan 28, 2019
  • PublishedFeb 27, 2019

Abstract

Most of the supercapacitors reported in literatures showed little or no flexibility in the working temperature around 150°C. However, the supercapacitors are generally exposed under complex system or extreme temperature, such as electric vehicles and extremely cold area. Herein, we successfully fabricated a large-scale robust nanocarbon hybrid film consisting of reduced graphene oxide (rGO), carbon nanotubes (CNTs) and MnOx nano-flowers with the size up to 550 cm2. The mechanical properties of the hybrid films depend on the ratio of CNTs. The supercapacitors prepared with the hybrid films exhibit high flexibility and keep their performances in a temperature range from −20 to 200°C. In addition, the devices display remarkable electrochemical and deformation stability at extreme temperature. This strategy has a potential for the more efficient preparation of flexible electrode materials.


Funded by

the Key Research and Development Program of Shandong Province(2017GGX20123)

the Fundamental Research Funds for the Central Universities of China(17CX02063,18CX02158A)


Acknowledgment

This work was supported by the Key Research and Development Program of Shandong Province (2017GGX20123) and the Fundamental Research Funds for the Central Universities of China (17CX02063 and 18CX02158A).


Interest statement

The authors declare no conflict of interest.


Contributions statement

Zang X and Hou Y designed and performed the experiments and contributed equally to this work; Wang T and Zhang R engineered the samples; Zang X wrote the paper with support from Hou Y; Zang X, Zhu H and Kang F conceived and supervised the project. All authors contributed to the general discussion.


Author information

Xiaobei Zang is currently an assistant professor of China University of Petroleum (East China). She received her PhD in the School of Materials Science and Engineering, Tsinghua University, China, and received her BSc degree (2007) and MSc degree (2010) from the College of Mechanical and Electronic Engineering, China University of Petroleum (East China). Her research interest focuses on nanocarbon-based electrode materials for flexible energy storage devices.


Yi Hou is a senior student in the School of Materials Science and Engineering, Tsinghua University, China. His research interest includes energy storage devices based on low-dimensional materials.


Feiyu Kang is a professor of the School of Materials Science and Engineering, and also a Dean in the Graduate School at Shenzhen, Tsinghua University, China. He received his PhD degree from The Hong Kong University of Science and Technology. His research is focusing on nanocarbon materials, graphite, porous-carbon, thermal conductive materials, lithium ion battery, supercapacitors, and electric vehicles.


Hongwei Zhu is a professor of the School of Materials Science and Engineering, Tsinghua University, China. He received his BSc degree in mechanical engineering (1998) and PhD degree in materials processing engineering (2003) at Tsinghua University. His current research interest involves macrostructure assembly and engineering of graphene and carbon nanotubes, and their applications in flexible energy devices, sensors, and membranes for water desalination and purification.


Supplement

Supplementary information

Supporting data are available in the online version of the paper.


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  • Figure 1

    Photographs (a), tensile strain-stress curves (b) and SEM images (c–e) of large-scale robust rGO/CNT films; SEM image (f) and high-magnification SEM image (g) of the rGO/CNT/MnOx films.

  • Figure 2

    Schematic illustration (a) and electrochemical performance of supercapacitor based on rGO/CNT/ MnOx films. (b) CV curves (200 mV s−1), (c) GCD curves (0.1 mA cm−2) and (d) cycling stability and rate capacitance (inset).

  • Figure 3

    Electrochemical properties of the flexible supercapacitors in two temperature-changing test modes. (a, b) Post-temperature-change test; (c, d) real-time test.

  • Figure 4

    EIS plots (a) and the real and imaginary parts of the capacitance of flexible devices at RT, −20 and 200°C (b–d).

  • Figure 5

    The flexibility of supercapacitors. (a) Deformation test, (b) CV curves after curling at 200°C, and (c, d) the deformation stability at 200°C.

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